An early taste of summer along the east coast could be replaced by wild winds and rain in the late afternoon, as a wall of thunderstorms moves right across the country.
Sydney is expected to enjoy a maximum of 30C on Monday, with beaches packed in a typical taste of warm weather for early Spring.
A similarly hot 28C day in Brisbane and the Gold Coast will see families flock to the water on the first day of school holidays, with low COVID-19 numbers allowing free movement.
The warm weather comes after much of central Australia was hit with strong winds, heavy rain, and flash flooding over the weekend courtesy of a low pressure system.
And that cold trough looks set to return on Monday evening, with Melbourne set for severe thunderstorms during the day which will hit southwest Queensland and New South Wales by the evening.
A wall of thunderstorms is moving across the country (pictured) with possible late afternoon wild winds and rain on the east coast despite warm temperatures earlier in the day
Temperatures reached the high 20s in Melbourne over the weekend leading some beachgoers to head out to St Kilda for a breather from the city's strict lockdowns
Broken Hill in outback New South Wales experienced intense flooding over the weekend (pictured) as central Australia was hit with wild weather
The storms may reach Sydney in the evening most likely after 7pm while the forecast temperature is expected to reach 30C in the hottest part of the day.
Over the weekend rain drenched much of central Australia with northern parts of South Australia experiencing flooding and outback Queensland seeing gale force winds.
Wilcannia Airport, in regional NSW, recorded 43.8mm on Sunday which makes it the wettest September day in more than 20 years for the town.
Many other areas in western NSW also experienced their wettest September day in more than four years.
'On Monday Sydney will see warm weather reaching 30C in the afternoon with late showers and thunderstorms possible for late this afternoon and early evening.' Bureau of Meteorology senior meteorologist Dean Narramore told Daily Mail Australia.
'There is also the chance of severe thunderstorms in the western suburbs with rain, large hail and damaging winds.'
Mr Narramore said the storms should clear later in the evening with a possible shower on Tuesday and the rest of the week looking fine with mild temperatures.
Further north there is a strong wind warning in place for Byron Coast, Coffs Coast, Macquarie Coast and Hunter Coast.
In Victoria, there will be